解方程组:2x+y+z=190 x+2y+z=200 x+y+2z=210
已知x、y、z满足方程组:x+y-z=6;y+z-x=2;z+x-y=0 求x、y、z的值
解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3
解方程组2x+y-z=7 x+y+z =1 2x-y-z=5
解方程组:2x+y+z=15 x+2y+z=16 x+y+z=17
解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7.
解方程组{2x+3y+z=11,x+y+z=0,3x-y+z=-2.
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
x+z=y 7*x=y+z+2 x+y+z=14 解这个方程组、
x+y/2=z+x/3+y=z/4,...x+y+z=27.解方程组.
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6